US6006152A - Method and device for monitoring the position of a variable valve control - Google Patents

Method and device for monitoring the position of a variable valve control Download PDF

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Publication number
US6006152A
US6006152A US08/872,709 US87270997A US6006152A US 6006152 A US6006152 A US 6006152A US 87270997 A US87270997 A US 87270997A US 6006152 A US6006152 A US 6006152A
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United States
Prior art keywords
nonuniformity
rotational speed
crankshaft
valve control
variable valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US08/872,709
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English (en)
Inventor
Dietmar Schwarzenthal
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Assigned to DR. ING. H.C.F. PORSCHE AG reassignment DR. ING. H.C.F. PORSCHE AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHWARZENTHAL, DIETMAR
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Assigned to DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT (COMPANY NUMBER 722287) reassignment DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT (COMPANY NUMBER 722287) MERGER (SEE DOCUMENT FOR DETAILS). Assignors: DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT (COMPANY NUMBER 5211)
Assigned to PORSCHE ZWISCHENHOLDING GMBH reassignment PORSCHE ZWISCHENHOLDING GMBH MERGER (SEE DOCUMENT FOR DETAILS). Assignors: DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT
Assigned to DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT reassignment DR. ING. H.C.F. PORSCHE AKTIENGESELLSCHAFT CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: PORSCHE ZWISCHENHOLDING GMBH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0223—Variable control of the intake valves only
    • F02D13/0234—Variable control of the intake valves only changing the valve timing only
    • F02D13/0238—Variable control of the intake valves only changing the valve timing only by shifting the phase, i.e. the opening periods of the valves are constant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2201/00—Electronic control systems; Apparatus or methods therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method and a device for monitoring the position of a variable valve control.
  • Methods are also known for detecting when combustion does not occur in internal combustion engines, said methods being based on an analysis of the curve of the angular velocity of the crankshaft during one working cycle of a cylinder of the internal combustion engine. Failure of combustion to occur results in particular changes in the speed curve by comparison to the normal state.
  • a method of this kind is described for example in German Patent Document DE 40 09 285 A1.
  • an object of the invention is to provide a method and a device for monitoring the position of a variable valve control in which the construction cost is reduced.
  • the invention is based on the fact that the combustion process in the individual cylinders is also dependent on the operating behavior and/or operating state of a variable valve control.
  • the combustion state of the individual cylinders changes considerably.
  • This combustion process and/or its change can be detected using the analysis, known of itself, of the angular velocity of the crankshaft, more specifically the uniformity of the rotary movement of the crankshaft.
  • Information about the operating state of the variable valve control is then obtained from the combustion process and/or the uniformity of rotation of the crankshaft as detected.
  • the invention is associated with the particular advantage that in addition to reducing the cost of measurement technology, since a sensor for the angular position of the crankshaft is provided in any case in modern internal combustion engines, only the operating state of a variable valve control is determined on the basis of the combustion state of the engine as influenced by the variable valve control. This is especially important if monitoring of the variable valve control is required for monitoring and detecting the maintenance of legally prescribed exhaust values (OBD II).
  • OBD II legally prescribed exhaust values
  • the invention offers the additional advantage that both control and monitoring of the variable valve control take place in the engine control device. Since this engine control device receives the signal from the crankshaft angle sensor in any event, the invention can be implemented within an engine control device without additional leads or pins being required on the control device.
  • crankshaft angle sensor signal is evaluated by the irregularity of the rotational speed of the crankshaft that is determined being compared with boundary values that are stored as normal or reference values in a memory and depend on the load and rotational speed of the internal combustion engine.
  • Monitoring the variable valve control according to the invention can be presented as part of a program-controlled control device for the vehicle (method), and with the same advantages, and as a discrete circuit (device).
  • FIG. 1 is a schematic diagram of an internal combustion engine with a variable valve control and a control device therefor constructed in accordance with preferred embodiments of the present invention
  • FIG. 2 is a block diagram depicting a first embodiment for an evaluation device located in the control device and for a monitoring device;
  • FIG. 3 is a flowchart depicting a second embodiment of a program process that takes place in the control device.
  • FIG. 4 is a graph showing nonuniformity of the rotational speed of a crankshaft, an average of this nonuniformity of the rotational speed of the crankshaft, a normal value for the nonuniformity of the rotational speed of the crankshaft, as well as an output signal VC from the control device as a function of time t to illustrate the operation.
  • FIG. 1 shows in schematic form an internal combustion engine 1 equipped with a variable valve control 2, in other words, a control in which the ratio of the angular position of a camshaft 3, in this case the intake camshaft, is variable with respect to the angular position of a crankshaft 4 by means of an adjusting device 5.
  • Adjusting device 5 is controlled by a control device 6 which, in addition to additional signals from a crankshaft sensor 7 not shown, receives a signal KW for the angular position of crankshaft 4 and a signal DK from a throttle sensor 8, said signal DK corresponding to the load on internal combustion engine 1.
  • a display 9 is also controlled by control device 6.
  • a control device 6 has, among other things, a valve control device 10, an evaluation device 11, and a monitoring device 12. Evaluation device 11 and monitoring device 12 together with crankshaft sensor 7, which in this case acts as a sensing device to detect nonuniformity of the rotational speed of crankshaft 4, together constitute a device for monitoring the position of variable valve control 2.
  • evaluation unit 11 receives from crankshaft sensor 7 a signal KW corresponding to the angular position of crankshaft 4.
  • this signal consists of a pulse train, with each pulse corresponding to a specific section of an angle swept by crankshaft 4.
  • a mark 13 is made that generates a special pulse and therefore makes it possible to determine the absolute position of the crankshaft.
  • a discriminator unit 14 evaluates the position of crankshaft 4 with the aid of crankshaft signal KW and generates a signal each time a combustion process takes place in a cylinder 15 of engine 1.
  • the crankshaft signal KW is differentiated by a differentiator 16 to obtain a signal DN that describes a lack of uniformity of the angular motion of crankshaft 4.
  • the nonuniformity signal DN is fed by a switch 17 to an average former 18, with switch 17 being controlled by the output signal from discriminator 14 and closing only when discriminator 14 detects a combustion process.
  • a signal MDN is applied to the output side of average former 18, said signal describing the average of the nonuniformity of the angular motion of crankshaft 4 at those points in time at which a combustion process takes place in cylinder 15.
  • monitoring device 12 also receives signal DK from throttle sensor 8.
  • signal DK of throttle sensor 8 and depending on signal KW from crankshaft sensor 7 normal values for the average of the nonuniformity of the rotational speed of the crankshaft MDN are stored in a memory 19.
  • a comparator 20 compares the current average of the nonuniformity of the rotational speed of the crankshaft MDN with the normal value of the nonuniformity of the rotational speed of the crankshaft NDN determined previously, and transmits a signal VC to control display 9 when the difference between the two values exceeds a predetermined value.
  • output signal VC indicates that variable valve control 2 is in its operating position, in which the internal combustion engine is delivering higher power, while when output signal VC is absent the variable valve control is in its resting position and internal combustion engine 1 is delivering less power.
  • a signal V supplied to both evaluation device 11 and monitoring device 12 is generated by valve control 10 and indicates that valve control 10 is engaged, controlling adjusting device 5 and thus moving variable valve control 2 into its activated state.
  • Signal V is used for both evaluation device 11 and monitoring device 12, in other words, both devices are active only when valve control 10 is performing an adjustment of variable valve control 2.
  • the invention can also be a part of a programmed process when control device 6 is a control device with a program memory.
  • a program process is shown in FIG. 3 as the second embodiment, in the form of a flowchart.
  • the process begins with a step 30 in which a check is made to determine whether the position of variable valve control 2 is to be changed. If this is not the case, the program process ends immediately and step 31 follows instead.
  • step 31 signal KW from crankshaft sensor 7 and signal DK from throttle sensor 8 are detected as input values.
  • this information is used in the same way as in the first embodiment to determine the crankshaft rotational speed N and the nonuniformity of the rotational speed of the crankshaft DN.
  • the average MDN is then calculated in step 33, with this calculation taking into account only those values of the nonuniformity of the rotational speed of the crankshaft DN that are detected during a combustion process.
  • the crankshaft angle KW helps to determine whether a combustion process is taking place or not.
  • the normal value for the nonuniformity of the rotational speed of the crankshaft NDN is read from a characteristic map that depends on the throttle position DK and the crankshaft rpm N.
  • valve control 2 is adjusted so that engine 1 delivers a higher torque.
  • camshaft 3 has actually been adjusted and the combustion process in cylinder 15 has changed as a result, to the point where a higher torque is actually being applied to crankshaft 4, this becomes visible as an increase in both the nonuniformity of the rotational speed of the crankshaft DN and the average value of the nonuniformity of the rotational speed of the crankshaft MDN.
  • This signal VC can then be used in many different ways in the two embodiments.
  • display 9 is controlled with the aid of signal VC, said display indicating to the driver that valve control 2 is in its activated state.
  • signal VC from other control devices can be evaluated; in particular, it is logical to have valve control 10 evaluate signal VC as a check on the performance of the adjustment of valve control 2 and thus of the safety function of adjusting device 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US08/872,709 1996-07-10 1997-07-10 Method and device for monitoring the position of a variable valve control Expired - Lifetime US6006152A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19627796 1996-07-10
DE19627796A DE19627796A1 (de) 1996-07-10 1996-07-10 Verfahren und Vorrichtung zur Überwachung der Stellung einer variablen Ventilsteuerung

Publications (1)

Publication Number Publication Date
US6006152A true US6006152A (en) 1999-12-21

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US08/872,709 Expired - Lifetime US6006152A (en) 1996-07-10 1997-07-10 Method and device for monitoring the position of a variable valve control

Country Status (5)

Country Link
US (1) US6006152A (ko)
EP (1) EP0818619B1 (ko)
JP (1) JPH1073031A (ko)
KR (1) KR980009824A (ko)
DE (2) DE19627796A1 (ko)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6302085B1 (en) 1998-03-02 2001-10-16 Unisia Sec's Corporation Apparatus and method for detecting crank angle of engine
EP1457644A1 (en) * 2003-03-12 2004-09-15 Ford Global Technologies, LLC Method and apparatus for monitoring the position of a variable valve control
EP1462620A1 (en) * 2003-03-27 2004-09-29 Ford Global Technologies, LLC Method and apparatus for determining operational mode in a cam profile switching (cps) engine
EP1580407A1 (en) * 2004-03-26 2005-09-28 Ford Global Technologies, LLC Method for detection failure in a cam profile switching system
EP1754866A1 (en) * 2005-08-19 2007-02-21 Delphi Technologies, Inc. Method for diagnosing the operational state of a two-step variable valve lift device
US20090281712A1 (en) * 2006-10-17 2009-11-12 Timo Heider Method for Improving the Running Smoothness of an Internal Combustion Engine, Control Device and Internal Combustion Engine
US20110224861A1 (en) * 2010-03-12 2011-09-15 Toyota Jidosha Kabushiki Kaisha Abnormality diagnosis apparatus and abnormality diagnosis method for internal combustion engine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10001583C2 (de) * 2000-01-17 2002-03-21 Bosch Gmbh Robert Verfahren und Einrichtung zur Funktionsüberwachung eines Gasströmungssteuerorgans, insbesondere einer Drallkappe, bei einer Brennkraftmaschine
DE10028995B4 (de) 2000-06-16 2005-10-27 Siemens Ag Verfahren zur Bewertung der Phasenlage einer Nockenwelle eines Verbrennungsmotors, insbesondere für ein Kraftfahrzeug
DE102004023589B4 (de) * 2004-05-13 2007-09-27 Audi Ag Verfahren zur Erkennung einer Veränderung von Steuerzeiten von Gaswechselventilen von Zylindern eines Verbrennungsmotors
DE102006058571B4 (de) * 2006-12-12 2018-09-20 Continental Automotive Gmbh Verfahren zum Steuern einer Brennkraftmaschine und Brennkraftmaschine

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JPH055453A (ja) * 1991-06-28 1993-01-14 Mazda Motor Corp エンジンの燃焼制御装置
US5390537A (en) * 1992-11-11 1995-02-21 Honda Giken Kogyo Kabushiki Kaisha Combustion state-detecting system for internal combustion engines
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JPH07247815A (ja) * 1994-03-11 1995-09-26 Unisia Jecs Corp 内燃機関の動弁装置
JPH07293305A (ja) * 1994-04-26 1995-11-07 Honda Motor Co Ltd 内燃機関の制御装置
US5471869A (en) * 1993-09-10 1995-12-05 Honda Giken Kogyo Kabushiki Kaisha Combustion state-detecting system for internal combustion engines
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JP2693552B2 (ja) * 1989-02-22 1997-12-24 本田技研工業株式会社 内燃機関の動弁機構
EP0398481B1 (en) * 1989-05-18 1996-10-16 Ford Motor Company Limited Method and apparatus for diagnosing an electronic automotive control system by means of pattern recognition
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US5307670A (en) * 1990-11-01 1994-05-03 Fuji Jukogyo Kabushiki Kaisha Misfire discriminating method for an engine
DE4208033C1 (en) * 1992-03-13 1993-05-06 Audi Ag, 8070 Ingolstadt, De Identifying and monitoring selected cylinders of IC engine - forming difference value between two RPM values of cylinders in ignition sequence
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Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854283A (en) * 1973-10-25 1974-12-17 R Stirling Internal combustion steam generating system
US4964318A (en) * 1975-09-25 1990-10-23 Ganoung David P Engine control apparatus for improved fuel economy
US5033425A (en) * 1987-02-27 1991-07-23 Hitachi, Ltd. Internal combustion engine equipped with a torque controller
US5111405A (en) * 1989-06-13 1992-05-05 Hitachi, Ltd. Engine control system
DE4009285A1 (de) * 1989-08-23 1990-12-20 Audi Ag Verfahren zur zylinderselektiven ueberwachung des energieumsatzes bei einer mehrzylinder-brennkraftmaschine
JPH055453A (ja) * 1991-06-28 1993-01-14 Mazda Motor Corp エンジンの燃焼制御装置
US5443045A (en) * 1992-04-24 1995-08-22 Bimota, S.P.A. Two-stroke fuel-injected internal combustion engine
US5485374A (en) * 1992-06-03 1996-01-16 Hitachi, Ltd. Combustion-conditon diagnostic system and method for a multicylinder engine
US5390537A (en) * 1992-11-11 1995-02-21 Honda Giken Kogyo Kabushiki Kaisha Combustion state-detecting system for internal combustion engines
US5471869A (en) * 1993-09-10 1995-12-05 Honda Giken Kogyo Kabushiki Kaisha Combustion state-detecting system for internal combustion engines
JPH07247815A (ja) * 1994-03-11 1995-09-26 Unisia Jecs Corp 内燃機関の動弁装置
JPH07293305A (ja) * 1994-04-26 1995-11-07 Honda Motor Co Ltd 内燃機関の制御装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6302085B1 (en) 1998-03-02 2001-10-16 Unisia Sec's Corporation Apparatus and method for detecting crank angle of engine
EP1457644A1 (en) * 2003-03-12 2004-09-15 Ford Global Technologies, LLC Method and apparatus for monitoring the position of a variable valve control
EP1462620A1 (en) * 2003-03-27 2004-09-29 Ford Global Technologies, LLC Method and apparatus for determining operational mode in a cam profile switching (cps) engine
EP1580407A1 (en) * 2004-03-26 2005-09-28 Ford Global Technologies, LLC Method for detection failure in a cam profile switching system
EP1754866A1 (en) * 2005-08-19 2007-02-21 Delphi Technologies, Inc. Method for diagnosing the operational state of a two-step variable valve lift device
US20090281712A1 (en) * 2006-10-17 2009-11-12 Timo Heider Method for Improving the Running Smoothness of an Internal Combustion Engine, Control Device and Internal Combustion Engine
US7991541B2 (en) 2006-10-17 2011-08-02 Continental Automotive Gmbh Method for improving the running smoothness of an internal combustion engine, control device and internal combustion engine
US20110224861A1 (en) * 2010-03-12 2011-09-15 Toyota Jidosha Kabushiki Kaisha Abnormality diagnosis apparatus and abnormality diagnosis method for internal combustion engine
US8718865B2 (en) * 2010-03-12 2014-05-06 Toyota Jidosha Kabushiki Kaisha Abnormality diagnosis apparatus and abnormality diagnosis method for internal combustion engine

Also Published As

Publication number Publication date
DE19627796A1 (de) 1998-01-15
EP0818619A3 (de) 1999-11-03
JPH1073031A (ja) 1998-03-17
EP0818619B1 (de) 2003-08-06
KR980009824A (ko) 1998-04-30
EP0818619A2 (de) 1998-01-14
DE59710530D1 (de) 2003-09-11

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